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#include "qwaylandreadbackcglwindow.h"
#include "qwaylandshmbackingstore.h"

#include <OpenGL/OpenGL.h>
#include <OpenGL/glext.h>

QWaylandReadbackCGLWindow::QWaylandReadbackCGLWindow(QWindow *window, QWaylandReadbackCGLIntegration *cglIntegration)
    : QWaylandShmWindow(window)
    , m_CglIntegration(cglIntegration)
    , mContext(0)
    , m_buffer(0)
    , m_pixelBuffer(0)
{
}

QWaylandWindow::WindowType QWaylandReadbackCGLWindow::windowType() const
{
    //yeah. this type needs a new name
    return QWaylandWindow::Egl;
}


void QWaylandReadbackCGLWindow::setGeometry(const QRect &rect)
{
    QWaylandShmWindow::setGeometry(rect);

    if (m_buffer) {
        delete m_buffer;
        m_buffer = 0;

        CGLDestroyPBuffer(m_pixelBuffer);
        m_pixelBuffer = 0;
    }
}

CGLPBufferObj QWaylandReadbackCGLWindow::pixelBuffer()
{
    if (!m_pixelBuffer)
        createSurface();

    return m_pixelBuffer;
}

uchar *QWaylandReadbackCGLWindow::buffer()
{
    return m_buffer->image()->bits();
}

void QWaylandReadbackCGLWindow::createSurface()
{
    QSize size(geometry().size());
    if (size.isEmpty()) {
        //QGLWidget wants a context for a window without geometry
        size = QSize(1,1);
    }

    waitForFrameSync();

    CGLCreatePBuffer(size.width(), size.height(), GL_TEXTURE_RECTANGLE_ARB, GL_BGRA, 0, &m_pixelBuffer);

    delete m_buffer;
    m_buffer = new QWaylandShmBuffer(m_CglIntegration->waylandDisplay(),size,QImage::Format_ARGB32);
    attach(m_buffer);
}

